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October 18 -- When it snowed in Flagstaff, Ariz., recently, thousands of people woke up and turned up their electric heating, and Arizona Public Service saw electricity demand reach a morning peak. To meet the demand, the company used the previous afternoon’s sunshine. In a closely watched new solar project called Solana, the energy is gathered in a three-square-mile patch of desert bulldozed flat near Gila Bend, about 50 miles southwest of Phoenix. A sprawling network of parabolic mirrors focuses the sun’s energy on black-painted pipes, which carry the heat to huge tanks of molten salt. When the sun has set, the plant can draw heat back out of the molten salt to continue making steam and electricity.  >>View Article

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